How did the Chernobyl nuclear disaster affect other countries?

The Chernobyl nuclear disaster, which occurred in 1986, had significant cross-border effects, particularly in Europe. Radioactive fallout spread to various countries, with elevated radiation levels detected in nations such as Sweden, Finland, and beyond, prompting widespread health and environmental concerns. Many countries implemented stricter nuclear safety regulations and enhanced emergency preparedness measures in response to the disaster. Additionally, the event heightened public awareness and opposition to nuclear energy, influencing energy policies in several nations.